4x100W TDA7498 Class-D Amplifier Board

Brand:| Model: AA-AB33184
Product Video
Two TDA7498 Class-D amplifier ICs are used on this amplifier board to produce up to 100W into four channels.
  • 4 x 100W Class-D amplifier
  • Small footprint for space limited applications
  • Perfect amplifier for bi-amp applications
  • Built-in cooling fan and over-temp protection circuit
  • 14 to 39 VDC power supply required
Part # 
Weight: 1.35 lbs.  
List Price$59.99
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Buy 4-up$47.33
Part # 320-305
Qty:  EA
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Product Details

4x100W TDA7498 Class-D Amplifier Board

This amplifier board features two state-of-the-art, two-channel Class-D TDA7498 ICs, which deliver up to 100 watts per channel. The small 3.6" wide by 4.8" long footprint allows this amplifier board to be used in many applications were size constraints limit the use of conventional amplifiers. Additionally, separate inputs and outputs make this amplifier board perfect for bi-amplifier use. Just add a 14 to 39 VDC power supply, signal source, and speakers!

A low noise cooling fan is mounted atop the robust heatsink to maximize heat dissipation. Thermal, over/under voltage, and current protection circuits are also included to extend the longevity of the amplifier board. Four fixed gain settings are available to allow for volume control at the source, and dual stereo RCA line-level inputs are pre-attached. Mounting holes are provided as-is a 2.5 mm x 5.5 mm power jack for quick connection. Screw-down phoenix-type terminals are included for quick speaker wire connection.

• Two Class-D TDA7498 amplifier ICs
• Heatsink with attached fan
• Pre-drilled mounting holes
• Over-temperature, over/under voltage, and over current protection circuits
• Phoenix-type speaker terminals
• Four line-level RCA inputs

• Power output (w/ 36 VDC power supply): 100W x 4 (6 ohms, THD 10%), 80W x 4 (8 ohms, THD 10%), 78W x 4 (6 ohms, THD 1%)
• Frequency response: 22 to 22,000 Hz
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 39 VDC, 12A regulated
• Fixed gain settings: 25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB
• Power input jack: 2.5 x 5.5 mm, center-positive
• Dimensions: 6" L x 4.5" W x 1.4" H

4x100W TDA7498 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB33184
  • Part Number320-305
  • UPC844632096693
  • Product CategoryAudio Amplifier Boards & Modules
  • Unit of MeasureEA
  • Product Rating
    (4 Reviews)
  • Weight1.35 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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4x100W TDA7498 Class-D Amplifier Board

Product Q&A

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4x100W TDA7498 Class-D Amplifier Board

what size is the dc power supply input

Asked by: marc50
This uses a 2.5mm x 5.5mm input.
Answered by: MattP
Date published: 2014-11-26

can you use a acid battery and find the 2.5mmx5.5mm power adaptor and wire it the the battery to use for power

Asked by: marc50
Yes as long as the battery is between 14-39 volts.
Answered by: MattP
Date published: 2014-11-26

what all can power this amp besides the suggest power supply

Asked by: marc50
If you want the most from this amplifier, that is the only power supply I can suggest.
Answered by: MattP
Date published: 2014-11-20

Will this amp function if powered by a 12 volt car battery?

Asked by: Braf
Sure recommends a minimum voltage of 14V for this amplifier.
Answered by: MattP
Date published: 2014-11-26

can I use this amp to power a 2.1 stereo system? 100w for left, 100w for right, and 100w for the sub and then one unused 100w.

Asked by: djdaveastro09
Yes you can. You can also get a dual voice coil sub and wire each of the remaining two channels in to the subwoofer so a channel is not wasted.
Answered by: MattP
Date published: 2014-10-13

I'd like to build a mono PA amp using 4- 4" speakers. Could I use this amp in mono by strapping the 4 inputs together in parallel? Would this be effectively 400 watts?

Asked by: Spence242
Unfortunately you cannot strap or parallel the outputs of this amplifier together. You will get the same total output power simply by running each channel into each 4" driver.
Answered by: MattP
Date published: 2014-09-04

can two of those channels be bridged or not?

Asked by: aaaaa
Unfortunately no, these cannot be bridged.
Answered by: MattP
Date published: 2014-08-18

I plan to use a 4 x 100 amp in my golf cart.  Does the amp come on when it senses input or does there have to be a switch to turn it off and on?

Asked by: windgolf
Unfortunately this amp does not have any auto sensing circuitry, there will have to be a switch wired in line with it.
Answered by: MattP
Date published: 2014-06-18

What power supply will get me the most power/ what one is recommended 

Asked by: chubb
The power supply we recommend for this amp is below.http://www.parts-express.com/24-vdc-146a-350w-regulated-switching-power-supply--320-316
Answered by: MattP
Date published: 2014-06-13

How many Amps is required for the power supply 

Asked by: chubb
The minimum we recommend is about 14 amps.
Answered by: MattP
Date published: 2014-06-12

so i have 4 x 100w speakers with 2 of them being 6ohms and 2 being 8 ohms will this amp work to power all of them at the same time

Asked by: chubb
This amp is 4 separate channels so you would have no trouble at all powering two different sets of speakers with different impedances
Answered by: Chrisf
Date published: 2014-10-13

How does the sound quality compare to Tripath based amps ?

How does the sound quality of these boards compare to the Tripath based amps like the Lepai, Topping, or Dayton DTA-100 ?I'm probably going to be driving some outdoor Polk Atrium 4's, so I'm not really expecting audiophile reproduction, more of a subjective opinion on the sound quality.
Asked by: MikeyP
It's about the same. The only issue is providing a power supply large enough to get full power out of this amplifier. Some amplifiers are rated at say, 100W per ch. but that is at a high THD distortion level. The 100W is only when 1 or 2 outputs are driven at a time. This amp is rated honestly at 1% and 10% THD distortion. That indicates a realistic approach to specs. This will work fine your use.
Answered by: Joe from San Francisco
Date published: 2013-11-12

Using one input?

I'd like all 4 channels to play music from my iPod at the same time. Would a couple RCA Y cables and an RCA to 3.5mm work?
Asked by: Curtis
Yes this will work perfectly fine.
Answered by: MattP
Date published: 2014-10-13

Why does this amp clip at higher volumes?

When i turn up the volume on my phone or i-pod past 75% it cuts on and off rapidly until i turn it back down.
Asked by: robn2cars
That is the amp's over-current protection kicking in. All of the Sure amps based on the TDA7498 chip have this. These chips can only deliver a max of 7A, and as soon as you try going higher than that, the chip's built-in protection will kick in instantly. It's a very agressive protection, so even very short transients that are only slightly above 7A will cause it to kick in. Also, there is no way to disable this short-circuit protection.There are a few ways to avoid this problem:- Don't turn it up too much (obviously, although this of course isn't a very good method)- Use a power supply with a lower voltage. If the power supply's voltage is low enough, it simply won't be possible for the chip to deliver more than 7A. The required voltage for this will of course depend on the impedance of the speakers you use (a lower impedance will draw more current for a given voltage).- Use speakers with a higher impedance. For example, if you use a power supply with a voltage of 39V (the max recommended for this amp), then to make sure you never go above 7A, your speakers would have to be at least 5.6 ohms. However, it must be at least 5.6 ohms at ALL frequencies. The impedance of speakers varies with frequency, and crossovers will vary it even more, so even if you use "8 ohm" rated speakers, they might actually dip below 5.6 ohms at certain frequencies, which would still cause the short-circuit protection to kick in.Of course none of these methods are ideal because they mean either you can't use the amp to anywhere near its full potential, or it means tight limitations on which speakers you use, but there's nothing we can do it about with these TDA7498 amps.
Answered by: eboyer
Date published: 2013-12-18

How much volts does one chanel produce?

The input will be 35v.
Asked by: dejanb52
This depends entirely on the load of that channel specifically.
Answered by: MattP
Date published: 2014-05-21

Whats the difference?

Is there a difference between this amp and the one without the fan? The other one costs more and if the picture is accurate I don't see a header to add your own fan...
Asked by: neo31ny
The 320-302 is a slightly older version witha larger heatsink to negate the need of a fan. The 320-305 is a slightly smaller footprint.
Answered by: MattP
Date published: 2013-02-13

computer PSU?

i have a 288w (15A) 12 volt computer PSU. i was wondering if this would work on this amplifier?
Asked by: Eric1
Not recommended for this board, which prefers higher voltage power supplies in my experience. Would probably run, but with much reduced power output and possibly not so great sound quality. Much better idea to get the 24VDC Meanwell power supply (which works very well with the TDA7498 in my experience.Even for 12VDC class D designs, computer power supplies (especially the inexpensive smaller ones) tend to be noisy; most computer peripherals have on board regulator circuits as a consequence. Not great for powering audio amps, even those with good power supply noise rejection.
Answered by: Doc Jones
Date published: 2014-01-17

Is there a way to run one of the two amplifiers in bridged-mono?

I'm trying to creating a 2.1 system with a subwoofer, and I was wondering if there was any way that I could use two of the four channels for a single subwoofer driver?
Asked by: bdamico
You cannot bridge any of the channels in this amp because all 4 channels are already internally bridged.Something you could do is use a dual voice-coil (DVC) subwoofer, and power each voice coil from 2 of the channels on this board.
Answered by: eboyer
Date published: 2012-10-19

what about 4 ohms?

how many watts will this amp put out per channel if i used 4 ohm speakers?
Asked by: home theater guy
The company does not specify. They do not specify past 6 ohms and notice the distortion figures go up It appears this amp is happier with an 8 ohm load.
Answered by: MarkAJH
Date published: 2012-08-02

Difficulty operating from batteries in series.

In using standard 7.2 Ah SLA batteries... Three in series to make 40 volts causes this amp to have a clipping sound. When I drop it down to 24 volts (two batteries) It sounds louder and less clipping. What is the likely cause of this?I also own the 6x100 version of this amp, it behaves the same.
Asked by: TorClausen2
There is a difference between a battery and a power supply - even if both have the same voltage specification. Batteries start at a charged voltage and go down with usage. On music peaks, they can't supply the current needed for the power surge - hence clipping. If you want to use batteries, you need to do a complex set-up with an inverter or capacitors. Generally, if you have a mobile 12 volt use - just buy an amp designed for that application - they have sophisticated switching power supplies designed for battery use.
Answered by: MarkAJH
Date published: 2012-07-27

Gain Settings

I don't see it stamped on the board, like it is on other boards. There are a sw1-4 (missing a sw2) What are the settings? And where would I find them in the future?
Asked by: TorClausen2
Check page 11 of the users manual. On the product page - in the right column, there is a link where you can download it.
Answered by: MarkAJH
Date published: 2012-07-08

How would this Amp run from a 24V Battery Pack?

I am building my own 20 Cell NiMH Battery pack, 2 12V units actually. If I use a battery pack, as the batteries drain, will the power/sound get lower with it? The battery's voltage drops as they drain, correct? Which Amp would be better for a compact, battery powered party box? This one, or the 4x100W 4 Ohm Amp?
Asked by: Leejin
This could be run from a battery pack, and 24 VDC will run this board. However, the board is designed to run on higher voltage, and will deliver only about 2/3 of rated power at 24V. As for the use of NiMH batteries, unless these are LARGE batteries (i.e. not the usual AA cells), they will be drained quickly powering a 50W amp. I would recommend something smaller (e.g. a Lepai 2020) that would run on 12V and give you some battery longevity and still provide you with good output into efficient speakers.And, yes, as the batteries drain, the amp produces less power output.
Answered by: Doc Jones
Date published: 2012-06-01
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